Cadmium-cobalt bearing alloy



June 9, 1936. w. E. MOCULLOUGH 2,043,588

CADMIUM COBALT BEARING ALLOY Filed April 1, 1955 3110mm: WILLIAM E.McCuL1 oucaH M m 1W Gttornegs Patented June 9, 1936 UNITED STATES PATENT OFFICE;

2,043,588. CADMIUM-COBALT anama mor William E. McCullough, Detroit: Mich., assignor to Bohn Aluminum & Brass Corporation, Detroit, Mich., a corporation of Michigan .Application April 1; 1935, Serial No. 14,177

' 1 Claim. (01'. 75-151) The invention relates tobearing metal alloys pearance. It will also be noted that these needleand has for its object the obtaining of a material like elements traverse t e grains at dlflelent having novel and valuable characteristics. More angles. particularly, it is an object to obtain a journal hysical tests show c an ed properties bearing which will stand up under high speed undoubtedly are due to this changed structure. operation and without objectionable lapping or Thus at room temperature pure cadmium has a abrading action on the journal. "In the present Brinell ha d ss of Whereas my improved state of the art a type of bearing extensively used ad um cobalt y, has a Brinell ardness Of is one provided with a steel backingor shell and 31.2. Steel backed bearings lined with my cada lining of bearing metal. Among the essential millm Cobalt alloy exhibit a u rm y te ac ous characteristics of the bearing metal are, first, that bond between the linin metal and the Steel and it should form a -fi'rm bond with a steel shell or when n st t el journal 0 200 Brinell backing; second, that it should possess suflicient gave the following test in 0011198415011 with babbltt inherent strength to sustain the load; third, that linedrbearingsi its bearing surface should be free from any constituent which will cause an abrading or lapping action on the journal; fourth, that it should have x A B c a meiting point sufllciently high to withstand the temperatures to which it is subjected in use. It Alloy go is difllcult to obtain any one material having all 5' 5 5; E a" of these characteristics. Thus tin base babbitts E a 5 5 are low in melting point and form a comparaa i". a; a 3 m E 3 at I tively weak bond with the steel backing. Alloys,

having a cadmium base with a hardening constituent such as copper. magnesium orhickel o gglg itt i223 3 $32 3 533 32% $5 $3 a stronger bond with the steel, but have a ten- C D P---- 2 1652 2948 2 dency to cause more or less lapping or abrasion of the journal. I have discovered that a cadmium base alloy using cobalt in place of copper or nickel as the hardening element has greatly improved properties, particularly in the absence of any tendency to lap or abrade the journals. The invention therefore consists in the cadmium cobalt alloy as hereinafter set forth.

35 In the drawing:

Fig. .1 illustrates a photomicrograph of my im- From the foregoing it will be apparent that the structure of hardening constituent, gives a bearing-performance approximately five times better than that of a tin base babbitt when run under the same conditions, viz: bearing pressure 3097 pounds per square inch; R. P. M. 4070 on a journal of 2.125 diameter. It was also shown by these proved bearing material at a magnification of tests that the cadmium cobalt alloy has little tendfifty diameters; may to lap the journal.

Figs. 2 and 3 are similar views at a magniflcawhl-le v descrlbed i aving only 10 on respectively of 100 and 500 diameters the' two constituents, cadmium and cobalt, it is The spegmc n represented in the drawing h obvious that other elements may be added to. imis one containin'g 1.5% of cobalt and the balance P desired Specific Properties While still retaincadmi This exact proportion is not,.however, m the advantages o h cob cadmium essenti l for all uses, as'I have discovered that bin'ation. 1 as high as 10% cobalt may be used for certain What I claim as my invention is:

n s and less than 1.5% in others. An alloy containing 1.5% to 10% of cobalt and The photomicrographs of'the polished surface the balance of cadmium. of this metal disclose a granular background in I I whichis imbedded a constituent of needle-like ap- WILHAM E. MCCULLOUGH.

cadmium cobalt alloy having the needle-like 

